The sentence that uses a relative clause is, at the carnival Fred won a stuffed animal, which he have to his girl friend.
What is relative clause?
A relative clause is a type of clause that gives the reader more information about the reason to the other noun, its a dependent clause.
Because the relative clause is a clause that gives the reader more information about the reason to the other noun, and its a dependent clause. Relative clause are, that, who, which, whom, etc. So, in the given sentences relative clause is used, at the carnival Fred won a stuffed animal, 'which' he gave to his girl friend.
Hence the correct option is, C. At the carnival Fred won a stuffed animal, which he gave to his girl friend.
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